Preparation Process of an Aluminum-chromium Alloy Cylinder Liner

ABSTRACT

The invention relates to an aluminum complex alloy cylinder liner preparation process. The raw materials can be vacuum dried and put into a high-speed rolling ball mill for 20-80 hours, before being ground and sieved at 200 mesh. The sieved material can then be mixed with purified water in a stirring mill and stir for 1-4 hours, while a 0.5-2 wt % dispersant and binder are added, to produce a solid content that is a stable slurry of 60-70 wt %. The stable slurry can be dried and granulated into an average particle size of 100-200 mesh. The granulated powder can then be cold isostatic pressed in a mold to form a tube-shaped alloy blank, wherein the molding pressure is 130-250 MPa, and the holding time is 1-10 minutes, high temperature vacuum sintering of the alloy blank, sintering temperature 1500-1600 degrees, heat preservation 3-6 hours, and vacuum degree controlled at −0.098 MPa.

BACKGROUND

This application claims priority to Chinese application No. 201910677170.6 entitled, “Preparation process of high-performance, low-cost, long-life aluminum cylinder sleeve,” filed Jul. 25, 2019 by Inventor/Applicant Fan Xingkuan.

TECHNICAL FIELD

The invention belongs to a special structural alloy material, and specifically relates to a preparation process of a high-performance, low-cost, long-life aluminum alloy cylinder liner.

BACKGROUND

The invention belongs to a special structural alloy material, and specifically relates to a preparation process of a high-performance, low-cost, long-life aluminum alloy cylinder liner.

The high-pressure mud pump is the heart of the oil drilling and geological exploration workbench. The mud pump cylinder liner is an important component of the mud pump. The currently used mud pump cylinder liner is divided into bimetallic cylinder liner, pure alumina ceramic cylinder liner and pure oxidation It is made of three materials of lead ceramic cylinder liner: It is made from thousands of working conditions, the metal cylinder liner is not wear-resistant, corrosion-resistant, and erosion-resistant, and the service life is very short; the pure alumina ceramic cylinder liner has low strength and toughness. It is easy to break under high pressure; the pure lead oxide ceramic sleeve is easy to powder, low thermal conductivity, large expansion coefficient, low hardness, easy to damage the matching piston, and high processing cost, still cannot achieve the desired results.

SUMMARY

The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a preparation process of low-cost, simple processing method, reasonable process, stable and reliable product quality, high performance, low cost, long life aluminum alloy cylinder liner. The formula for preparing raw materials of the present invention is as follows: based on industrial alumina coarse powder, the content is 50-80 wt %, and the granules. The degree is between 2-10 microns, the fine powder of alumina after high temperature sintering and crushing is 5-20 wt %, and the particle size is 0.5-1.5 micrometers, 800-mesh zirconite powder 1-10 wt %, 800-mesh metal tungsten powder 0.2-2 wt %, 800-mesh talc powder 0.2-2 wt %, 800-mesh metal chromium powder 0.2-2 wt %, 800 mesh manganese 0.2-2 wt %, 800 mesh metal nickel powder 0.2-2 wt %, and 800 bentonite 0.2-2 wt %.

The raw materials weighed according to the formula are vacuum-dried and put into a high-speed rolling ball mill for 20-80 hours. The mill is sieved through 200 mesh, and then the sieved material and purified water are put into the stirring mill and stirred 1-4. Hours, add 0.5-2 wt % dispersant and binder at the same time, and then grind and defoam the slurry to prepare a stable slurry with a solid content of 60 70 wt %;

Dry and granulate the stable slurry into an average particle size of 100-200 mesh, fluidity of 30-40 seconds, bulk density of 1.0-1.8 g/cm3, and moisture content of 0.4-1 wt %. Grain powder

The granulated powder is cold isostatic pressed in a mold to make a tubular alloy blank, in which the forming pressure is 130 250 MPa, the holding time is 1-10 minutes, and the high temperature vacuum sintering of the alloy blank is performed. The temperature is 1500-1600 degrees, the heat preservation is 3-6 hours, the vacuum degree is controlled at −0.098 MPa. In one embodiment, the mold can be rubber. In another embodiment, the mold can be plastic. In another embodiment, the mold can be metal.

Process the outer circle and the two end faces of the alloy tube sintered at high temperature and vacuum, and place the processed alloy tube in a metal jacket that has been fully preheated and expanded;

Rough grinding and polishing the inner circle of the alloy tube to prepare a high-performance, low-cost, long-life aluminum-chromium alloy cylinder liner.

The interference between the processed alloy tube and the metal jacket is 0.10-0.70 mm, the assembly temperature between the alloy tube and the gold jacket is 300-600 degrees, and the holding time is 1-6 hours.

The preparation method of the invention is simple, the process is reasonable, the qualified rate of finished products is high, the production cost is greatly reduced, the quality of the prepared product is stable and reliable, and the service life of the product is greatly extended.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic longitudinal cross-sectional view of an aluminum-chromium alloy cylinder liner of the present invention.

DETAILED DESCRIPTION

The present invention discloses a high-performance, low-cost, long-life aluminum-alloy alloy cylinder liner process, which is based on industrial alumina coarse powder, adding fine aluminum powder, aluminum stone powder, metal pigeon powder, which have been crushed by high temperature sintering, talc powder, metal powder, metal powder, metal baht powder, bentonite; the above raw materials are made into high-speed dry ball milling, wet stirring ball milling, spray drying to make alloy granulated powder, and then the alloy granulated powder is passed through cold, etc. Static pressure forming, high temperature vacuum sintering process into alloy tube, the outer circle and the two end faces of the alloy tube are processed, the processed alloy tube is placed in a metal jacket that has been fully preheated and expanded, and naturally cooled to room temperature to the alloy tube. Round rough grinding and polishing, so as to prepare high-performance low-cost long-life aluminum-chromium alloy cylinder liner. The preparation method of the invention is simple, the process is reasonable, the qualified rate of finished products is high, the raw material cost is low, the quality of the prepared product is stable and reliable, the service life of the product is greatly extended, and the average service life is not less than 2000 hours.

The present invention will be further described in detail in conjunction with the embodiment examples and the attached drawings 1 below. A preferred embodiment is as follows: weigh 65 wt % of industrial alumina coarse powder according to the formula, average particle size is 6 microns, alumina fine powder is 20 wt %, average particle size is 0.8 microns, 800 mesh zirconite powder 8 wt %, 800 mesh metal tungsten powder 1 wt %, 800 mesh talc 1.5 wt %, mesh metal chromium 1 wt %, 800 mesh metal manganese powder 1 wt %, 800 mesh metal nickel powder 1 wt %, and 800 bentonite 1.5 wt %.

The preparation method is as follows: The raw materials weighed according to the formula are vacuum dried and put into a high-speed rolling ball mill for 50 hours. The mill is sieved and filtered through 200 meshes. Agents and binders, aging and defoaming the slurry by milling to prepare a stable slurry with a solid content of 65 wt %; Dry and granulate the stable slurry into an average particle size of 200 mesh, a fluidity of 38 seconds, a bulk density of 1.4 g/cm3, and a moisture content of 0.7 wt % granulated powder; The granulated powder is cold isostatic pressed in a mold to form a tube-shaped alloy blank, in which the molding pressure is 180 MPa, holding time is 8 minutes, high temperature vacuum sintering of the alloy blank the sintering temperature is 1550 degrees, heat preservation for 4 hours, the vacuum degree is controlled at −0.098 MPa. The mold can also be plastic or metal. Process the outer circle and the two end faces of the alloy tube 2 that has been sintered at high temperature and vacuum, and place the processed alloy tube 2 into the metal jacket 1 that has been fully preheated and expanded. Then, rough grind and polish the inner circle of the alloy tube 2 to prepare a high-performance low-cost long-life aluminum complex alloy cylinder liner. The interference between the processed alloy tube 2 and the gold jacket 1 is 0.45 mm, the assembly temperature between the alloy tube 2 and the metal jacket 1 is 480 degrees, and the holding time is 4 hours. As prepared, the Rockwell Hardness (HRA) is 96. The Bending strength (MPa) is 609. The fracture toughness (MPa·Ml/2) is 6.5. The bulk density (g/cm3) is 4.3. The finish is 0.14 μm. Abrasion (laboratory) is 50 times higher than high-chromium cast iron. The preparation method of this embodiment is simple, the process is reasonable, the qualified rate of finished products is high, the production cost is greatly reduced, the quality of the prepared product is stable and reliable, and the service life of the product is greatly extended. The average service life is not less than 1,000 hours. Another preferred embodiment: Weigh 60 wt % of industrial aluminum coarse powder according to the formula, with an average particle size of 7 microns, alumina fine powder 15 wt %, the average particle size being 1 micron, 800 mesh zirconite powder 6 wt % 800 mesh metal tungsten 0.6 wt %, 800 mesh talc, powder 0.8%, 800 mesh metal chromium powder 0.8 wt %, 800 mesh metal manganese 0.9 wt %, 800 mesh metal nickel powder 0.9 wt %, 800 bentonite 1.2 wt %.

The preparation method is as follows: The raw materials weighed according to the formula are vacuum-baked and put into a high-speed rolling ball mill for 40 hours. Grind the sieve 200 mesh, then put the sieved material and purified water in the stirring mill and stir for 3 hours, add 1.5 wt % dispersant and binder at the same time, and then grind and defoam the slurry to prepare the solid content 60-70 wt % stable slurry; Dry and granulate the stable slurry into an average particle size of 150 mesh, a fluidity of 35 seconds, a bulk density of 1.0-1.8 g/cm3, and a moisture content of 0.4-1 wt %; the granulated powder is cold isostatic pressed in a rubber mold to make a tubular alloy hair, in which the molding pressure is 220 MPa, the holding time is 6 minutes, the alloy hair is also subjected to high temperature vacuum sintering, and the sintering temperature is 1600-Degree, heat preservation for 5 hours, vacuum degree controlled at 0.098 MPa; Process the outer circle and two end faces of the alloy tube 2 sintered at high temperature and vacuum, and place the processed alloy tube 2 into the metal jacket 1 that has been fully preheated and expanded; Rough grinding and polishing the inner circle of alloy tube 2 to prepare a high-performance, low-cost, long-life aluminum-chromium alloy cylinder liner. As prepared, the prepared product will have a Rockwell hardness (HRA) is 95, bending strength (MPa) is 608, the Fracture toughness (MPa·Ml/2) is 6.3, the bulk density (g/cm3) is 4.2, the finish is 0.15 μm, and abrasion (laboratory) is 50 times higher than high-chromium cast iron.

The interference star between the processed alloy tube 2 and the metal jacket 1 is 0.43 mm, the assembly temperature between the alloy tube 2 and the metal jacket 1 is 493 degrees, and the holding time is 5 hours.

The preparation method in this embodiment is simple, the process is reasonable, the qualified rate of finished products is low, the cost of raw materials is low, the quality of the prepared product is stable and reliable, the service life of the product is greatly extended, and the average service life is also not less than 2000 hours. 

1. An aluminum-chromium alloy cylinder liner preparation process comprising combining raw materials, said raw materials comprising an industrial alumina coarse powder as a base, the content at 50-80 wt % and its particle size between 2-10 microns a high temperature Calcined and crushed alumina fine powder the content at 5-20 wt % and its particle size between 0.5-1.5 microns, an 800 mesh zirconite powder at 1-10 wt %, an 800 mesh metal tungsten powder 0.2-2 wt %, an 800 mesh talc powder 0.2-2 wt %, an 800 mesh metal chromium powder 0.2-2 wt %, an 800 metal manganese powder 0.2-2 wt %, an 800 mesh metal nickel 0.2-2 wt %, and an 800-900 mesh bentonite 0.2-2 wt %; said combining raw materials as follows: vacuum drying the raw materials, rolling said raw materials in a ball mill for 20-80 hours, milling the raw materials using a 200-mesh sieve to produce a sieved material mixing said sieved material and purified water in a stirring mill stirring said sieved material and said purified water for 1-4 hours, and adding 0.5-2 wt % dispersant and binder during the 1-4 hours of stirring to form a slurry, and the slurry is aged and defoamed to prepare a stable slurry with a solid content of 60-70 wt %.
 2. The method of claim 1 further comprising the steps of drying and granulating said stable slurry into a granulated powder having an average particle size of 100-200 mesh, fluidity of 30-40 seconds, bulk density of 1.0-1.8 g/cm3, and moisture content of 0.4-1 wt %.
 3. The method of claim 2 further comprising the steps of cold isostatic pressing said granulated powder in a mold to make a tubular alloy blank, in which a forming pressure is 130-250 MPa and the holding time is 1-10 minutes; and subjecting said alloy blank to a high temperature vacuum sintering at a sintering temperature of 1500-1600 degrees, heat preservation for 3-6 hours, and vacuum degree controlled at −0.098 MPa, to form an allow tube.
 4. The method of claim 3 further comprising the steps of processing the outer circle and both ends of said alloy tube (2) by sintering, and placing the alloy tube (2) into a metal jacket (1) that has been preheated and expanded.
 5. The method of claim 4 further comprising the steps of rough grinding and polishing the inner circle of the alloy tube.
 6. The method of claim 5 wherein the interference between said alloy tube (2) and said metal jacket (1) is 0.10-0.70 mm, the assembly temperature between the alloy tube (2) and said metal jacket (1) is 300-600 degrees, and a heat preservation time is 1-6 hours.
 7. The method of claim 5, wherein the content of said industrial alumina coarse powder is 65 wt % and the average particle size of said industrial alumina course powder is 6 microns, the content of said alumina fine powder is 20 wt % and the average particle size of said alumina fine powder is 0.8 microns, the content of said 800 mesh zirconite powder is 8 wt %, the content of said 800 mesh metal tungsten powder is 1 wt %, the content of said 800 mesh talc powder 1.5%, the content of said 800 mesh metal chromium powder is 1 wt %, the content of said 800 mesh metal manganese powder 1 wt %, the content of said 800 mesh metal nickel powder 1 wt %, and the content of said 800 mesh bentonite is 1.5 wt %.
 8. The method of claim 7 wherein said raw materials are rolled in said ball mill for 50 hours.
 9. The method of claim 8 wherein said sieved material and said purified water are stirred for 2 hours.
 10. The method of claim 9 wherein the content of said dispersing agent and binder is 2 wt %.
 11. The method of claim 10 wherein said stable slurry comprises a solid content of 65 wt %.
 12. The method of claim 11 wherein said granulated powder has an average particle size of 200 mesh, a fluidity of 38 seconds, a bulk density of 1.4 g/cm3, and a moisture content of 0.7 wt %.
 13. The method of claim 12 wherein the said forming pressure is 180 MPa and said holding time is 8 minutes, said sintering temperature is 1550 degrees, said heat preservation 4 hours, and said vacuum is controlled at −0.098 MPa.
 14. The method of claim 6 wherein said metal jacket is 0.45 mm.
 15. The method of claim 14 wherein the assembly temperature between said alloy tube and said metal jacket is 480 degrees, and said holding time is 4 hours.
 16. The method of claim 3 wherein said mold is rubber.
 17. The method of claim 3 wherein said mold is plastic.
 18. The method of claim 3 wherein said mold is metal.
 19. The method of claim 1 wherein said bentonite is 800-mesh bentonite.
 20. The method of claim 1 wherein said bentonite is 900-mesh bentonite. 